A. I
noticed in the scene that the store seemed to carry a large number of Mexican
products, such as Bimbo brand bread. So at first, I tried finding a listing
of local stores carrying that brand. That didn't work.

So
I moved on to another strategy. In the scene outside the store, in the
parking lot (where Dexter jots down the predator's license plate), I could
see what appeared to be one of the Long Beach's Blue-Line light-rail stations
in the background, and a tall building behind it. The problem was which
light-rail station? It turns out that Long Beach has a lot of them.

So
I did the necessary legwork - metaphorically speaking, of course. I
went to Live Local's aerial photos and followed the train tracks
throughout the city, looking at each station and trying to match the building
that can be seen behind that station. Google StreetView came in
handy for those comparison peeks. I spent a long time doing this,
and finally found the right one, with the matching building and, sure enough,
the supermarket right across the street. But I was surprised to find that
it was right next to the donut shop, that
I already knew about...